Since a rear end collision was repaired, I have found that my rear stationwagon wiper, washer fluid, and defogger do not work. None of these work when I turn them on. Is there a fuse? I can not figure out how to check the fuses

I would actualy think less a fuse, and more a "someone forgot to plug it all back in". I'm trying to remember, so don't quote me, but I think the harness connection is on the passenger side. I would pull the rear paneling down and follow the harness. Check for any connectors not plugged in, or any ground connections not installed correctly. Since it's just been repaire, go there first.

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This must be the fuse and is found under the dash within the car. If the fuse blows out then you must check the wiring to the front washer motor and to the rear.
Disconnect and check the rear and the front washers.

The hose could be pinched some where along the line or there could be something plugging it. I once found a holder in the back of one of my own vehicles that held washer fluid. I found it by accident. There could be one there, and it could be covered, worth the look, I think.

fuse No. 9 powers the solid state time inside rear defogger control and washer/wiper switch.There is also a circuit breaker 15 that provides the actual power for the defroster grid. Fuse 10 provides power for the wiper/washer function. Fuses and circuit breaker are located in the Instrument panel fuse block.

check the fuse first. dealer can hook up NGS Tester and get fault codes to see what is wrong.

Principles of Operation NOTE: The generic electronic module (GEM) will not activate the rear wiper system if either the liftgate or the liftgate glass is ajar. If either the liftgate or the liftgate glass becomes ajar while the rear wiper is in operation, the GEM will park the rear wiper motor.
There are two distinct modes of wiper operation:

Off Mode: In this mode, there is no rear wiper activity, and the wiper motor will be in the PARK position.

Interval Mode: This mode is selected when the rear wiper switch is in either the Interval 1 or 2 position. When this mode is selected, the rear wiper motor is driven up onto the glass by activating the rear wiper UP relay. When the wiper motor HIGH/LOW/PARK position input reaches the high position, the UP relay is deactivated and the DOWN relay is activated to reverse the wiper motor direction. When the wiper motor reaches the LOW position, as determined by the HIGH/LOW/PARK position input, the GEM deactivates the DOWN relay and will begin a new wiper cycle 1 to 10 seconds later, depending on the interval position selected.

To engage the rear window washer, rotate the rear window washer selector downward to the WASH position. The rear window wiper will run as long as the WASH position is selected. When the rear window washer selector returns to the OFF, INT 1 or INT 2 position, the washer will stop immediately, but the rear window wiper will continue for two to three sweeps and then return to its previous mode of operation.
The low washer fluid indicator chime warns that the washer fluid level is low. The low washer fluid indicator chime is a single tone with a duration of one second. The chime will sound when the low washer fluid indicator is initially activated.
The low washer fluid indicator warns that the fluid level in the washer reservoir is low. The low washer fluid indicator will illuminate when the washer fluid level is low and the ignition switch is in the RUN position.
The low washer fluid indicator will deactivate when the washer fluid reservoir is filled and the ignition switch has been cycled from RUN to OFF, then to RUN. Inspection and Verification

The wiper/washer system is a generic electronic module (GEM) controlled system; refer to Section 419-10 .

Verify the customer concern by operating the wiper/washer system.

Visually inspect for obvious signs of mechanical and electrical damage.

Have you checked the wire harness that goes between the hatch and the body? The constant opening and closing weakens the wires. Could also be the ground wire, I believe is inside the hatch. It could have come undone. If you have an owners manual, it should guide you to the defogger fuse. Hope this helps. Best wishes.